Median reach rate in 10k IG cohorts: 18.4%, but the spread is wide

Median reach rate in 10k IG cohorts: 18.4%, but the spread is wide

— n=420 accounts, 30-day window. 1k-10k: ████ 22% | 10k-100k: ███ 18% | 100k+: ██ 11%
— The 75th percentile sits near 27% for smaller cohorts, but drops faster than the median as account size grows. Delta is structural, not random.
— Common error: judging one post by the account average. Use a 10-post median, not a single outlier, and track confidence by cohort.

Rule set: compare like with like, keep sample size visible, and separate reach rate from conversion rate. Large accounts usually buy stability; small accounts buy variance.

So the check is simple: measure median by cohort, not by headline.